<template>
  <div class="cart">
    <h4>全部商品</h4>
    <div class="cart-main">
      <div class="cart-th">
        <div class="cart-th1">全部</div>
        <div class="cart-th2">商品</div>
        <div class="cart-th3">单价（元）</div>
        <div class="cart-th4">数量</div>
        <div class="cart-th5">小计（元）</div>
        <div class="cart-th6">操作</div>
      </div>
      <div class="cart-body">
        <ul class="cart-list" v-for="cart in cartInfo" :key="cart.id">
          <li class="cart-list-con1">
            <input type="checkbox" name="chk_list" :checked="cart.isChecked === 1" @click="changeListChecked(cart, $event)" />
          </li>
          <li class="cart-list-con2">
            <img :src="cart.imgUrl" />
            <div class="item-msg">{{ cart.skuName }}</div>
          </li>
          <li class="cart-list-con4">
            <span class="price" style="fontsize: 14px">{{ cart.skuPrice }}</span>
          </li>
          <li class="cart-list-con5">
            <a class="mins" @click="skuNumChanged('sub', -1, cart)">-</a>
            <input autocomplete="off" type="text" :value="cart.skuNum" minnum="1" class="itxt" @change="skuNumChanged('change', $event.target.value * 1, cart)" />
            <a class="plus" @click="skuNumChanged('add', 1, cart)">+</a>
          </li>
          <li class="cart-list-con6">
            <span class="sum">{{ cart.skuNum * cart.skuPrice }}</span>
          </li>
          <li class="cart-list-con7">
            <a class="sindelet" @click="deleteShopCart(cart)" style="cursor: pointer">删除</a>
            <br />
            <a href="#none">移到收藏</a>
          </li>
        </ul>
      </div>
    </div>
    <div class="cart-tool" v-cloak>
      <div class="select-all">
        <input class="chooseAll" type="checkbox" :checked="allChecked && cartInfo.length > 0" @change="changeChecked" />
        <span>全选</span>
      </div>
      <div class="option">
        <a @click="deleteAllCheckedCart">删除选中的商品</a>
        <a href="#none">移到我的关注</a>
        <a href="#none">清除下柜商品</a>
      </div>
      <div class="money-box">
        <div class="chosed">
          已选择 <span>{{ allGoodsNum }}</span
          >件商品
        </div>
        <div class="sumprice">
          <em>总价（不含运费） ：{{ totalPrice }}</em>
          <i class="summoney"></i>
        </div>
        <div class="sumbtn">
          <router-link class="sum-btn" to="/trade">结算</router-link>
        </div>
      </div>
    </div>
  </div>
</template>

<script>
import { mapGetters } from 'vuex'
import throttle from 'lodash/throttle'
export default {
  name: 'ShopCart',
  mounted() {
    this.getData()
  },
  methods: {
    getData() {
      this.$store.dispatch('shopcartStore/getShopChartInfo')
    },
    // 全选按钮
    changeChecked() {
      this.cartInfo.forEach((element) => {
        if (element.isChecked) {
          element.isChecked = 0
        } else {
          element.isChecked = 1
        }
        this.$store.dispatch('shopcartStore/updateCartById', { skuId: element.skuId, isChecked: element.isChecked })
      })
    },
    // 这里的后端接口有bug
    skuNumChanged: throttle(async function (type, val, cart) {
      console.log(type, val, cart)
      switch (type) {
        case 'add':
          val = 1
          break
        case 'sub':
          if (cart.skuNum > 1) {
            val = -1
          } else {
            val = 0
          }
          break
        case 'change':
          if (isNaN(val) || val < 1) {
            val = 0
          } else {
            val = parseInt(val) - cart.skuNum
          }
      }
      try {
        await this.$store.dispatch('detailStore/getShopChart', { skuId: cart.skuId, skuNum: val })
        this.getData()
      } catch (error) {
        alert(error.message)
      }
    }, 50),
    async deleteShopCart(cart) {
      try {
        await this.$store.dispatch('shopcartStore/deleteCartById', cart.skuId)
        this.getData()
      } catch (error) {
        alert(error.message)
      }
    },
    changeListChecked: throttle(async function (cart, e) {
      let isChecked = e.target.checked ? '1' : '0'
      try {
        await this.$store.dispatch('shopcartStore/updateCartById', { skuId: cart.skuId, isChecked })
        this.getData()
        // 删除后应当判断全选是否为false
        if (!this.cartInfo) {
          this.allChecked = false
        }
      } catch (error) {
        alert(error.message)
      }
    }, 20),
    async deleteAllCheckedCart() {
      try {
        await this.$store.dispatch('shopcartStore/deleteAllCheckedCartList')
        this.getData()
      } catch (error) {
        alert(error.message)
      }
    },
  },
  computed: {
    ...mapGetters('shopcartStore', ['cartInfoList']),
    // 购物车的数据
    cartInfo() {
      return this.cartInfoList.cartInfoList || []
    },
    // 全部商品总共的价格
    totalPrice() {
      return this.cartInfo.reduce((pre, cur) => {
        return pre + cur.skuPrice * cur.skuNum
      }, 0)
    },
    // 是否全选(速度跟页面上方的复选框更新不一致)
    allChecked() {
      return this.cartInfo.every((item) => item.isChecked === 1)
    },
    allGoodsNum() {
      return this.cartInfo.reduce((pre, cur) => {
        return pre + cur.skuNum
      }, 0)
    },
  },
}
</script>

<style lang="less" scoped>
.cart {
  width: 1200px;
  margin: 0 auto;

  h4 {
    margin: 9px 0;
    font-size: 14px;
    line-height: 21px;
  }

  .cart-main {
    .cart-th {
      background: #f5f5f5;
      border: 1px solid #ddd;
      padding: 10px;
      overflow: hidden;

      & > div {
        float: left;
      }

      .cart-th1 {
        width: 25%;

        input {
          vertical-align: middle;
        }

        span {
          vertical-align: middle;
        }
      }

      .cart-th2 {
        width: 25%;
      }

      .cart-th3,
      .cart-th4,
      .cart-th5,
      .cart-th6 {
        width: 12.5%;
      }
    }

    .cart-body {
      margin: 15px 0;
      border: 1px solid #ddd;

      .cart-list {
        padding: 10px;
        border-bottom: 1px solid #ddd;
        overflow: hidden;

        & > li {
          float: left;
        }

        .cart-list-con1 {
          width: 15%;
        }

        .cart-list-con2 {
          width: 35%;

          img {
            width: 82px;
            height: 82px;
            float: left;
          }

          .item-msg {
            float: left;
            width: 150px;
            margin: 0 10px;
            line-height: 18px;
          }
        }

        .cart-list-con4 {
          width: 10%;
        }

        .cart-list-con5 {
          width: 17%;

          .mins {
            border: 1px solid #ddd;
            border-right: 0;
            float: left;
            color: #666;
            width: 6px;
            text-align: center;
            padding: 8px;
          }

          input {
            border: 1px solid #ddd;
            width: 40px;
            height: 33px;
            float: left;
            text-align: center;
            font-size: 14px;
          }

          .plus {
            border: 1px solid #ddd;
            border-left: 0;
            float: left;
            color: #666;
            width: 6px;
            text-align: center;
            padding: 8px;
          }
        }

        .cart-list-con6 {
          width: 10%;

          .sum {
            font-size: 16px;
          }
        }

        .cart-list-con7 {
          width: 13%;

          a {
            color: #666;
          }
        }
      }
    }
  }

  .cart-tool {
    overflow: hidden;
    border: 1px solid #ddd;

    .select-all {
      padding: 10px;
      overflow: hidden;
      float: left;

      span {
        vertical-align: middle;
      }

      input {
        vertical-align: middle;
      }
    }

    .option {
      padding: 10px;
      overflow: hidden;
      float: left;

      a {
        float: left;
        padding: 0 10px;
        color: #666;
      }
    }

    .money-box {
      float: right;

      .chosed {
        line-height: 26px;
        float: left;
        padding: 0 10px;
      }

      .sumprice {
        width: 200px;
        line-height: 22px;
        float: left;
        padding: 0 10px;

        .summoney {
          color: #c81623;
          font-size: 16px;
        }
      }

      .sumbtn {
        float: right;

        a {
          display: block;
          position: relative;
          width: 96px;
          height: 52px;
          line-height: 52px;
          color: #fff;
          text-align: center;
          font-size: 18px;
          font-family: 'Microsoft YaHei';
          background: #e1251b;
          overflow: hidden;
        }
      }
    }
  }
}
</style>